<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="../js/vue.js"></script>
</head>
<body>
<div id="app">
    <button v-on:click="num++">增加</button>
    <button @click="decrement">减少</button>
    <h2>
        num={{num}}
    </h2>
    <hr>
</div>
<script type="text/javascript">
    var app=new Vue({
        el:"#app",
        data:{
            num:1
        },
        methods:{
            decrement(){
                this.num--;
            }
        }
    });
</script>

</body>
</html>